Patents Examined by Dean H. Reichard
  • Elevator rotary lost door interlock
    Patent number: 5203431
    Abstract: An elevator door interlock has a camming surface which is in contact with a lead of an electrical circuit during normal operation and has a bridge thereon. The interlock rotates the camming surface along the lead to contact the bridge if an elevator door is locked, to not contact the lead if the elevator door is not locked, and to rotate the camming surface out of contact with the leads if the door is missing.
    Type: Grant
    Filed: February 25, 1992
    Date of Patent: April 20, 1993
    Assignee: Otis Elevator Company
    Inventors: Michael P. Donohoe, Richard E. Kulak, Christian G. Tonna